Blueberry Frozen Yogurt

It's easy to make frozen yogurt by flavoring plain yogurt and then, well, freezing until icy in texture. Here, fresh blueberries, sugar, and lemon zest and juice are blended to a puree, then mixed with yogurt; to avoid overmixing, pulse rather than process. It's also helpful to taste the puree and adjust by adding more sugar and/or lemon juice to suit your tastes. Also, and importantly to achieving the proper consistency, chill the mixture in the refrigerator before churning in the ice cream machine.